922197216721 has 27 divisors (see below), whose sum is σ = 1029800106153. Its totient is φ = 825214448520.

The previous prime is 922197216671. The next prime is 922197216767. The reversal of 922197216721 is 127612791229.

The square root of 922197216721 is 960311.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 922197216721 - 2⁷ = 922197216593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (922197216221) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 707748556 + ... + 707749858.

Almost surely, 2^922197216721 is an apocalyptic number.

922197216721 is the 960311-st square number.

922197216721 is the 480156-th centered octagonal number.

It is an amenable number.

922197216721 is a deficient number, since it is larger than the sum of its proper divisors (107602889432).

922197216721 is an frugal number, since it uses more digits than its factorization.

922197216721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2762 (or 1381 counting only the distinct ones).

The product of its digits is 381024, while the sum is 49.

Multiplying 922197216721 by its sum of digits (49), we get a square (45187663619329 = 6722177²).

The spelling of 922197216721 in words is "nine hundred twenty-two billion, one hundred ninety-seven million, two hundred sixteen thousand, seven hundred twenty-one".